JP2016066220A - Storage, storage control method and storage control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage, a storage control method and a storage control program capable of reducing a processing load due to file rearrangements.SOLUTION: A storage unit 15 has plural hierarchies. A group management part 11 manages a file, which is stored in any of the hierarchies of the storage unit 15, while dividing the same into plural groups. A shift determination part 12 selects a group, which satisfies hierarchy-shift conditions, from the plural groups as an object hierarchy-shift. A file shift part 13 shifts a file which is included in the group selected by the shift determination part 12 from the hierarchy in which the file is stored to another hierarchy.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a storage apparatus, a storage apparatus control method, and a storage apparatus control program.

  In recent years, the amount of data handled by computers has been steadily increasing. For this reason, the storage capacity of storage devices used as storage devices by computers is also increasing.

  Some storage media mounted on a storage device have various performances. In general, a high-performance storage medium such as an SSD (Solid State Drive) or SAS (Serial Attached SCSI (Small Computer System Interface)) disk device is expensive and it is difficult to secure a large capacity. On the other hand, a low-performance storage medium such as a NEARLINE SATA (Serial Advanced Technology Attachment) disk device is inexpensive and it is easy to secure a large capacity.

  Therefore, in order to cope with an increase in storage capacity and realize cost reduction, storage media having different performances are often arranged in the storage device in consideration of a balance between storage capacity and cost. A storage apparatus that mounts storage media having different performances is called a hierarchical storage apparatus. In this case, a group of storage media having different performance corresponds to a tier.

  In a tiered storage device, transparent access is desired with optimal file placement for storage media with different performance. In order to realize them, in a hierarchical storage device, hierarchical processing is performed in which data with high file access frequency is placed on a higher-speed storage medium and files with low access frequency are placed on a lower-speed storage medium. Is called.

  As data relocation methods in a tiered storage apparatus, for example, there are two methods, a tier migration type and a caching type. Hierarchical storage type storage devices relocate files with high access frequency to higher-speed storage media, and relocate files with low access frequency to lower-speed storage media. Further, a caching storage device uses a high-speed storage medium as a cache. Specifically, a caching storage device places all files on a low-speed storage medium, places files with high access frequency on a high-speed storage medium, and stores files with low access frequency at high speed. Delete from the media.

  Both the tier migration type and caching type storage apparatuses check the access status in units of files and place the files at appropriate positions. Hereinafter, file movement by the tier migration type and caching type storage apparatuses is referred to as file rearrangement.

  Criteria for performing file relocation are given by user-customizable demote and promote policy settings. Here, demotion refers to the movement of a file in an upper layer to a lower layer or deletion of a file in an upper layer used as a cache. Further, promotion refers to movement of a file in a lower hierarchy to an upper hierarchy or copying to an upper hierarchy used as a cache, in other words, caching. Furthermore, the policy is setting information in which a determination condition for determining whether to perform demotion or promotion is recorded for each file.

  For example, the policy of demotion can be set such that a file whose number of days since the last access has exceeded a predetermined number of days that have been determined in advance for each file is demoted or deleted from the cache. In this example, the last access time included in the metadata of each file is used for relocation determination. The metadata is information including file management information such as creation date / time, creator, and data format. The promotion policy can be set such that a file whose number of accesses per unit time exceeds a predetermined threshold is promoted or copied to a higher hierarchy. In this example, a value obtained by referring to FCL (File Change Log) and counting the number of times of reference for each file is used for determination of rearrangement. Here, the FCL is a repository that records readings and writings that access files in the file system.

  As such a file relocation technique, a conventional technique has been proposed in which the access frequency is monitored for each file, a load-concentrated disk device is extracted, and the load is distributed. Further, a conventional technique for migrating data between file servers based on a migration policy by an administrator has been proposed.

Japanese Patent Publication No. 08-20990 JP 2005-215715 A JP 2010-257095 A

  However, when promotion / demotion is managed in units of files, the processing time increases as the number of files increases. For example, in the case of the above-described demotion determination, since the determination is performed by checking the last reference date and time of the file, the processing time increases because the metadata of all files is referred to. Further, in the case of the above-described promotion determination, the determination is performed by analyzing the FCL. However, if the number of target files increases, the FCL also becomes enormous, which also increases the analysis processing time. Further, when searching for a large amount of metadata or analyzing an FCL, there is a possibility that the CPU (Central Processing Unit) usage rate becomes high.

  For this reason, for example, in an environment where a large number of files are stored or an environment with a large amount of access per unit time, such as when handling a file number exceeding hundreds of millions or billions, the load is high. The situation continues for a long time, causing trouble in business access. Furthermore, for example, it may be possible to spend 24 hours or more in the metadata search or FCL analysis processing, and it may be impossible to complete the processing once a day.

  The disclosed technique has been made in view of the above, and an object thereof is to provide a storage apparatus, a storage apparatus control method, and a storage apparatus control program in which a processing load due to file rearrangement is reduced.

  In one aspect, the storage device, the storage device control method, and the storage device control program disclosed in the present application have a plurality of hierarchies. The group management unit manages a file stored in one of the hierarchies of the storage unit by dividing it into a plurality of groups. A movement object selection part selects the group which satisfy | fills hierarchy movement conditions among the said several groups as an object of the movement of the said hierarchy. The file moving unit moves the belonging file belonging to the group selected by the moving target selecting unit from the hierarchy in which the belonging file is stored to another hierarchy.

  According to one aspect of the storage device, the storage device control method, and the storage device control program disclosed in the present application, it is possible to reduce the processing load due to the rearrangement of files.

FIG. 1 is a block diagram of the storage apparatus according to the first embodiment. FIG. 2 is a diagram showing the relationship between files on the logical tree and files on the hierarchical storage. FIG. 3 is a schematic diagram when a plurality of file systems exist in the storage apparatus. FIG. 4 is a diagram for explaining the relocation policy definition. FIG. 5 is a diagram illustrating an example of the FCL. FIG. 6 is a diagram for explaining metadata. FIG. 7 is a diagram illustrating an example of a hierarchy management table. FIG. 8 is a diagram of an example of a logical tree when a relocation target directory is set. FIG. 9 is a diagram of an example of a logical tree when a non-relocation target directory is set. FIG. 10 is a diagram illustrating an example of lowering the relocation target directory. FIG. 11 is a diagram illustrating an example of lowering a relocation target directory in which a direct file exists. FIG. 12 is a diagram illustrating an example of raising the relocation target directory. FIG. 13 is a diagram showing an example of raising the relocation target directory where the same file exists. FIG. 14 is a diagram illustrating the states of two relocation target directories. FIG. 15 is a flowchart of a file relocation process performed by the storage apparatus according to the first embodiment. FIG. 16 is a flowchart of the directory hierarchy lowering process. FIG. 17 is a flowchart of the directory hierarchy up process. FIG. 18 is a diagram of an example of a hierarchy management table according to the second embodiment. FIG. 19 is a diagram illustrating an example of lowering a relocation target directory by grouping. FIG. 20 is a flowchart of file relocation processing by the storage apparatus according to the second embodiment. FIG. 21 is a hardware configuration diagram of the storage apparatus.

  Hereinafter, embodiments of a storage apparatus, a storage apparatus control method, and a storage apparatus control program disclosed in the present application will be described in detail with reference to the drawings. The storage device, the storage device control method, and the storage device control program disclosed in the present application are not limited by the following embodiments.

  FIG. 1 is a block diagram of the storage apparatus according to the first embodiment. As illustrated in FIG. 1, the storage apparatus 1 according to the present embodiment includes a group management unit 11, a movement determination unit 12, a file movement unit 13, a request processing unit 14, and a storage unit 15.

  In this embodiment, the storage unit 15 includes a flash 151, a SAS 152, and a SATA 153. Here, in this embodiment, the case of having three different types of storage media will be described. However, if the storage unit 15 has two or more types of storage media and is hierarchized, the types of storage media There are no particular restrictions.

  In the following, the hierarchy of Flash 151, SAS 152, and SATA 153 will be referred to as Tier # 1, Tier # 2, and Tier # 3, respectively. That is, Tier # 1 is the fastest storage medium hierarchy, and stores files that are required to be processed at high speed. Tier # 2 is the second fastest storage medium hierarchy, and processing speed may be slower than the file stored in Tier # 1, but processing is faster than the file stored in Tier # 3. Stores the files that need to be done. Tier # 3 is the lowest storage medium hierarchy, and stores files that do not require high-speed processing. Here, the ranking of Tier # 1 is the highest and the ranking of Tier # 3 is the lowest. In the following, rearranging a file to a higher hierarchy is referred to as “elevation” of the file. In addition, rearranging a file to a lower hierarchy is called “demotion” of the file.

  Furthermore, the storage apparatus 1 according to the present embodiment performs file relocation in units of directories. Therefore, a directory that is a target for determining whether or not to move a file under its control is referred to as a “relocation target directory”. In the following, a hierarchy to which a directory in a logical tree representing a directory hierarchy is referred to as a “directory hierarchy”. That is, as the directory hierarchy is higher, the directory is higher in the logical tree. Hereinafter, changing the relocation target directory to a directory higher in the directory hierarchy is referred to as “rising” of the relocation target directory. In addition, changing the relocation target directory to a directory lower in the directory hierarchy is referred to as “lowering” of the relocation target directory. Further, the promotion and demotion of the relocation target directory are collectively referred to as “migration” of the relocation target directory.

  FIG. 2 is a diagram showing the relationship between files on the logical tree and files on the hierarchical storage. In FIG. 2, the upper part is a logical tree 200 representing a hierarchical structure of a logical directory, and the lower part represents a storage unit 15 of the storage device 1 that is a hierarchical storage. The file in the logical tree 200 is physically stored in the storage medium to which the correspondence is represented by a broken-line arrow.

  In this embodiment, files are rearranged in units of directories in the logical tree 200. Specifically, as will be described below, in this embodiment, which directory is determined as the relocation target directory to be relocated, and the file relocation is performed for each relocation target directory. Perform placement. Here, changing the relocation target directory in the logical tree 200 and changing the hierarchy for storing the physical file are independent of each other.

  In the present embodiment, the flash 151 stores a hierarchy management table 51, a relocation policy definition 52, metadata 53, and an FCL 54.

  Here, the storage apparatus 1 has a plurality of file systems. FIG. 3 is a schematic diagram when a plurality of file systems exist in the storage apparatus. The hierarchy management table 51, the relocation policy definition 52, the metadata 53, and the FCL 54 are prepared for each file system as shown in FIG. For example, when there are three types of file systems # 1 to # 3 as shown in FIG. 3, the hierarchy management table 51, the relocation policy definition 52, the metadata 53, and the FCL 54 are provided for each of the file systems # 1 to # 3. Exists. In this case, a flash 151, a SAS 152, and a SATA 153 are assigned to each of the file systems # 1 to # 3 to be hierarchized. Then, the flash 151 of each of the file systems # 1 to # 3 stores the hierarchy management table 51, the relocation policy definition 52, the metadata 53, and the FCL 54.

  FIG. 4 is a diagram for explaining the relocation policy definition. The relocation policy definition 52 is a condition for determining whether to relocate a file under the relocation target directory. In this embodiment, the relocation policy definition 52 is applied to all the relocation target directories existing in one file system. For example, the demotion policy can be set such that if a file under a certain directory has no reference for a predetermined number of days, the file under that directory is relocated to a higher tier. Further, for example, the promotion policy can be set so that a file under a directory is promoted if the total number of times the files under the directory are referred to is a predetermined number or more.

  Other than this, the relocation policy definition 52 may use other criteria as long as it is a criterion that can determine the frequency of use of files under the directory. For example, the demotion policy may be set using the last update date and time. Further, the promotion policy may be set using an access frequency obtained by dividing the number of reads and the number of writes per unit time. Further, the promotion policy may be set so that the file is promoted when the total read size of the files under the relocation target directory exceeds a threshold value. Further, the promotion policy may be set so that the file is promoted when the total write size of the files under the relocation target directory exceeds a threshold value. Even if the number of times of reference is used, for example, the average number of accesses to each file under the relocation target directory can be used.

  FIG. 5 is a diagram illustrating an example of the FCL. As shown in FIG. 5, in the FCL 54, for example, one access to each file is recorded in one line. For example, the FCL 54 records the access time, information on the accessed user, file path, and access type. When a change is made, the change content is further recorded in the FCL 54. In this embodiment, since the FCL 54 is not used for file relocation, the storage apparatus 1 may not have the FCL 54.

  FIG. 6 is a diagram for explaining metadata. As shown in FIG. 6, it has an inode area 531 and a directory block 532. Inode is management information of each file and directory.

  The inode area 531 is an area for storing the inode. In the inode of the file, information such as the file access authority, the owner, the last reference date, the last update date, and the address where the file data is stored is recorded as file management information. In the directory inode, directory access authority, owner, last reference date, and last update date are recorded as directory management information. Further, in the directory inode, information such as a file name and a directory name existing in the directory, and an address where inode data is stored is recorded.

  The directory block 532 is an area for storing file names and directory names existing in the directory and inode information for each directory.

  For example, the directory block 532 stores the inode number 202 of the file E in association with the file name 201 of the file E. If the inode number 202 of the file E is “3”, the information of the file E is stored in the entry 203 where ino = 3 in the inode area 531. The entry 204 stores the file last time 204 and the like.

  The directory block 532 stores the inode number 212 of the file C in association with the file name 211 of the file C. If the inode number 212 of the file C is “399”, the information of the file C is stored in the entry 213 in the inode area 531 where ino = 399. The entry 213 stores a data address 214 and the like.

  FIG. 7 is a diagram illustrating an example of a hierarchy management table. The hierarchy management table 51 holds relocation determination information related to a relocation target directory in the format shown in FIG. 7, for example, for each file system.

  “No.” is information for managing the numbers in the hierarchy management table 51 by serial numbers. “No.” is assigned a new number by the group management unit 11 when a new directory is newly selected as a relocation target directory.

  The “control directory inode” is a value set by the administrator and is the inode number of the relocation target directory. At the time of file rearrangement, a file under the directory is specified by the file moving unit 13 described later based on the number of the control directory inode.

  “Target only files directly” is information indicating whether or not only files directly under the relocation target directory, that is, files under the relocation target directory that are not included in the subordinate directory are to be relocated. It is. In the following, the file directly under the directory is referred to as “direct file”. When this information is “Yes”, only the files immediately under the relocation target directory are to be relocated. When this information is “No”, files included in subdirectories under the relocation target directory are also relocation targets. “Only the files directly underneath” is information registered by the group management unit 11 in accordance with the operation.

  “Non-relocation” is information representing a directory that does not want to relocate the subordinate files. When this information is “Yes”, the directory is excluded from the relocation target, and the tier to which the directory belongs continues to be held. When this information is “No”, it is a relocation target. In this embodiment, at the start of operation of the storage apparatus 1, the relocation target directory and the non-relocation target directory are set by the administrator. Then, the setting information set by the administrator is recorded in the hierarchy management table 51 by the group management unit 11 described later. However, when no non-relocation target is provided in the storage apparatus 1, the group management unit 11 does not have to manage this element.

  “Access count” is the total number of accesses to the subordinate files managed by the relocation target directory. This information is obtained by accumulating the number of accesses to the subordinate files managed by the relocation target directory by the group management unit 11. This information is initialized by the group management unit 11 after the rearrangement process is completed. However, when the access count is not used for file relocation, the group management unit 11 does not have to manage this element.

  The “last reference date” is the last reference date for the file managed by the relocation target directory. Each time a file managed by the relocation target directory is referenced, the group management unit 11 updates the last reference date and time related to the relocation target directory. However, when the last reference date is not used for file rearrangement, the group management unit 11 does not have to manage this element.

  The “deletion deadline” is a value set by the administrator, and designates an elapsed date or a designated date / time from the last reference date / time. In the case of an elapsed date from the last reference date, for example, when “+365” is designated, the file moving unit 13 deletes the corresponding file that has passed 365 days from the last reference date. Further, in the case of the designated date and time, for example, when “2020.04.01 0:00” is designated, the file moving unit 13 deletes the corresponding file that has passed the designated date and time. As described above, the file moving unit 13 deletes a file whose expiration date has passed during the rearrangement process. When this information is “NULL”, the file managed by the relocation target directory is not deleted. However, when no deletion deadline is provided in the storage apparatus 1, the group management unit 11 does not have to manage this element.

  The “control directory automatic transition” is a value set by the administrator, and is a value that specifies whether or not the relocation target directory is automatically raised or lowered to another directory hierarchy. When this information is “Yes”, the relocation target directory is changed by the group management unit 11 based on the upper limit value and lower limit value of the designated access. When this information is “No”, the relocation target directory is fixed to that directory. When the automatic transition of the relocation target directory is not performed in units of the storage device 1 or the file system, the group management unit 11 does not have to manage this element.

  The “control directory access upper limit” is an upper limit value set by the administrator, and is used for the migration determination of the relocation target directory. When migration of the relocation target directory is not performed using this information for each storage device 1 or file system, the group management unit 11 does not have to manage this element.

  The “control directory access lower limit” is a lower limit value set by the administrator, and is used for the migration determination of the relocation target directory. When migration of the relocation target directory is not performed using this information for each storage device 1 or file system, the group management unit 11 does not have to manage this element.

  The administrator can customize the hierarchy management table 51. For example, the last update date and time, the number of reads per unit time and the access frequency for each number of writes, the total size of reading of files to be managed or the total size of writing may be added to the hierarchy management table 51. Thus, by adding new information to the tier management table 51, the storage apparatus 1 can use the added information for relocation determination.

  The group management unit 11 registers information on the relocation target directory in the hierarchy management table 51, thereby grouping, promoting, and demoting the relocation target directory. The management of the hierarchy management table 51 by the group management unit 11 will be specifically described below.

  At the start of file relocation operation, the group management unit 11 sets the directory inode, non-relocation target information, deletion deadline information, control directory automatic transition information, access number upper limit value and lower limit value from the administrator. Receive input. Then, the group management unit 11 assigns a number to the serial number in the hierarchy management table 51 for each relocation target directory. Then, the group management unit 11 performs the inode of each relocation target directory, non-relocation target information, deletion time limit information, control directory automatic transition information, upper limit value and lower limit value of the number of accesses for the given number. Register.

  For example, FIG. 8 is a diagram of an example of a logical tree when a relocation target directory is set. FIG. 8 shows a case where all directories existing in the same hierarchy enclosed by a frame 301 are set as relocation target directories. As shown in FIG. 8, a directory to which the characters “control” are added at the upper left of each directory represents a relocation target directory. When specifying a relocation target directory, it is possible to specify a specific directory as a relocation target directory, or to specify directories included in the directory hierarchy as a relocation target directory as shown in FIG. It is also possible to do.

  In the relocation target directory, all files under the relocation are collectively relocated when the files are relocated. In the case of FIG. 8, all files belong to the relocation target directory.

  FIG. 9 is a diagram of an example of a logical tree when a non-relocation target directory is set. In FIG. 9, each directory surrounded by a frame 303 is a relocation target directory. A directory enclosed by a frame 302 is a non-relocation target directory. In this case, the files under each directory surrounded by the frame 303 are the files to be rearranged. On the other hand, the files under the directory enclosed by the frame 302 are excluded from the relocation target, and the stored Tier is retained.

  Here, when the relocation target directory and the non-relocation target directory are mistakenly set to the same directory, or when there is a directory that does not belong to any of the directories, the group management unit 11 selects either one of the directories. So that it belongs to Therefore, an example of a method for correcting the relocation target directory and the non-relocation target directory by the group management unit 11 will be described below.

  For example, the group management unit 11 determines whether all files except for files under a directory set as a non-relocation target belong to any of the relocation target directories. When there is a file that does not belong to any of the relocation target directories, the group management unit 11 assigns the highest-level directory among the directories that do not overlap with the already set relocation target directory as the relocation target directory. to correct.

  For example, a case where only the directory 303 among the directories enclosed in the frame 303 is not set as a relocation target directory will be described. In this case, the group management unit 11 specifies the directory 303 that is the highest-level directory among the directories that do not overlap with other relocation target directories, and assigns the directory 303 to the relocation target directory for correction.

  When the same directory matches both the non-relocation target directory and the relocation target directory, the group management unit 11 corrects the relocation target directory so as to give priority to the setting of the non-relocation target directory, for example.

  When the operation of file relocation is started, the group management unit 11 accumulates the number of accesses to the file managed by the relocation target directory registered in the hierarchy management table 51, and registers the access count. Further, the group management unit 11 updates the last access date / time of the relocation target directory in the hierarchy management table 51.

  Then, the group management unit 11 detects a relocation target directory whose access count has reached or exceeded the upper limit value. However, the group management unit 11 does not detect a directory whose non-relocation target directory is “Yes” or the control directory automatic transition is “No”. Hereinafter, a relocation target directory whose access count is equal to or greater than the upper limit is referred to as a “descent target directory”. Next, the group management unit 11 uses the metadata 53 to determine whether or not a directory (hereinafter referred to as “directly directory”) exists immediately below the descending target directory.

  When the direct directory exists, the group management unit 11 registers all the direct directories in the hierarchy management table 51 as relocation target directories. At this time, the group management unit 11 creates a new number assigned to the group management unit 11 in association with each directory directly below. Then, the group management unit 11 registers the setting information such as the deletion deadline set in the descending target directory and the upper limit value and the lower limit value of the access in the hierarchy management table 51 by taking over the directory immediately below. And the group management part 11 initializes the information of the access frequency and the last reference date.

  Further, the group management unit 11 uses the metadata 53 to determine whether or not a file immediately under the descending target directory exists. If there is no direct file, the group management unit 11 deletes the descending target directory from the hierarchy management table 51.

  On the other hand, when there is a file immediately underneath, the group management unit 11 sets “Yes” for the field for only the file directly under the descending target directory in the hierarchy management table 51, and the file managed by the descending target directory is only the direct file. And

  FIG. 10 is a diagram illustrating an example of lowering the relocation target directory. When the number of accesses exceeds the upper limit value and the directory 311 becomes the descending target directory, the group management unit 11 identifies the directories 312 and 313 as directories directly under the directory 311. The group management unit 11 sets the directories 312 and 313 as relocation target directories. In this case, the directory 311 is no longer a relocation target directory, and the directories 312 and 313, which are the two directories directly under the frame 314, are relocation target directories.

  Further, for example, in FIG. 10, when the number of accesses is equal to or greater than the upper limit value and the directory 315 is a descending target directory, the group management unit 11 confirms that there is no direct directory in the directory 315. In this case, the group management unit 11 keeps the directory 315 as a relocation target directory.

  FIG. 11 is a diagram illustrating an example of lowering a relocation target directory in which a direct file exists. When the number of accesses exceeds the upper limit value and the directory 321 becomes the descending target directory, the group management unit 11 sets the directory 325, which is the directory immediately below, as the relocation target directory. Furthermore, since the directory 321 has the direct file 322, the group management unit 11 sets the directory 321 as a relocation target directory where only the file 322 is a relocation target. In this case, the directory 325 surrounded by the frame 323 becomes the relocation target directory, and the set of the directory 321 and the file 322 surrounded by the frame 324 becomes the relocation target directory.

  In addition, the group management unit 11 detects a relocation target directory whose access count is equal to or lower than the lower limit value. However, the group management unit 11 does not detect a directory whose non-relocation target directory is “Yes” or the control directory automatic transition is “No”. In the following, the relocation target directory whose access count has become equal to or lower than the lower limit is referred to as “rising target directory”.

  Next, the group management unit 11 determines whether or not a directory exists above the ascent target directory, that is, whether or not the top of the ascent target directory is the top of the file system.

  When the upper directory of the increase target directory is the top of the file system, the group management unit 11 does not migrate the relocation target directory.

  On the other hand, if the upper directory of the rising target directory is not the top of the file system, the group management unit 11 determines whether or not the same directory that is a directory of the same hierarchy exists under the directory to which the rising target directory belongs. . In other words, the same directory is a side-by-side directory of the ascent target directory.

  When there is the same directory, the group management unit 11 determines whether or not the total number of accesses in the same directory is equal to or lower than the lower limit value. When there is a directory with the same number of accesses that is not less than the lower limit, the group management unit 11 does not migrate the relocation target directory.

  On the other hand, when there is an identical directory whose number of accesses is not less than or equal to the lower limit value, the group management unit 11 registers, in the hierarchy management table 51, the directory immediately above the one layer above the ascending target directory as the relocation target directory. . At this time, the group management unit 11 creates a new numbered row in the group management unit 11 corresponding to the directory directly above. Then, the group management unit 11 registers the setting information such as the deletion deadline set in the ascent target directory and the upper limit value and lower limit value of the access in the hierarchy management table 51 by taking over the directory immediately above. And the group management part 11 initializes the information of the access frequency and the last reference date.

  Further, the group management unit 11 deletes the ascent target directory and the same directory from the hierarchy management table 51.

  FIG. 12 is a diagram illustrating an example of raising the relocation target directory. When the number of accesses exceeds the upper limit value and the directory 331 becomes a rising target directory, the group management unit 11 specifies the directory 332 as a directory immediately above the directory 331. The group management unit 11 sets the directory 332 as a relocation target directory. In this case, the directory 331 is not a relocation target directory, and a directory 332 that is a directory immediately above the frame 333 is a relocation target directory.

  FIG. 13 is a diagram showing an example of raising the relocation target directory where the same file exists. When the number of accesses is equal to or lower than the lower limit value and the directory 341 becomes a rising target directory, the group management unit 11 specifies the directory 342 that is the same directory. If the number of accesses to the directory 342 is less than or equal to the lower limit value, the group management unit 11 sets the directory 343, which is a directory immediately above the directories 341 and 342, as a relocation target directory. In this case, the directory 343 surrounded by the frame 344 becomes a relocation target directory, and the directories 341 and 342 are not relocation target directories.

  As described above, the group management unit 11 lowers the relocation target directory when the number of accesses is large, and raises the relocation target directory when the number of accesses is small. This is because when the number of accesses to the files under the directory is large, it is considered that there are too many files to be relocated, and it is preferable to make a finer granularity determination to determine the relocation of the file. . Therefore, by lowering the relocation target directory when the number of accesses is large, the number of files managed by each relocation target directory can be reduced, the determination granularity can be made finer, and appropriate relocation can be performed. In addition, when the number of accesses to the files under the directory is small, there may be too few files to be relocated, and it is preferable to increase the granularity for determining the relocation of the file to reduce the processing. Therefore, by increasing the relocation target directory when the number of accesses is small, the number of files managed by each relocation target directory can be increased, the granularity of judgment can be increased, and relocation can be performed while performing appropriate relocation The judgment process can be lightened.

  Returning to FIG. 1, the description will be continued. The movement determination unit 12 stores a schedule for file relocation execution. When the timing of file relocation execution arrives, the migration determination unit 12 refers to the hierarchy management table 51 and identifies a relocation target directory. Further, the movement determination unit 12 acquires the promotion policy and the demoting policy corresponding to the file system to be relocated from the relocation policy definition 52. Here, in this embodiment, the case where the file rearrangement is executed according to a predetermined schedule has been described. However, the present invention is not limited to this. For example, the movement determination unit 12 receives an execution instruction from the administrator, Relocation may be performed. Then, the movement determination unit 12 extracts a relocation target directory that satisfies the promotion policy or the demotion policy as a relocation execution directory.

  For example, when the total access count is set to be equal to or greater than the total count threshold as the promotion policy, the movement determination unit 12 acquires the access count of each relocation target directory from the hierarchy management table 51. Next, the movement determination unit 12 extracts a relocation execution directory whose acquired number of accesses is equal to or greater than the total number threshold as a relocation execution directory for promoting a file.

  For example, when the average access count is set to be equal to or greater than the average threshold as the promotion policy, the movement determination unit 12 acquires the number of files for each relocation target directory from the metadata 53. Next, the migration determination unit 12 calculates the average number of accesses by dividing the number of accesses of each relocation target directory recorded in the hierarchy management table 51 by the number of files. Then, the movement determination unit 12 extracts a relocation target directory whose calculated average number of accesses is equal to or greater than the average number threshold as a relocation execution directory for promoting a file.

  For example, when it is set that there is no reference for a predetermined period as the demoting policy, the movement determination unit 12 acquires the last reference date and time of each relocation target directory on the hierarchy management table 51. Next, the movement determination unit 12 calculates the number of days from the acquired last reference date to the present. Then, the movement determination unit 12 extracts a relocation execution directory whose calculated number of days is equal to or longer than a predetermined period as a relocation execution directory for demoting a file.

  In such relocation execution directory determination processing, the directory used as the relocation execution directory by the movement determination unit 12 varies depending on the setting conditions of the demoting policy and the promotion policy. Here, with reference to FIG. 14, the difference in the selection of the relocation execution directory depending on the policy setting condition will be described. FIG. 14 is a diagram illustrating the states of two relocation target directories. For example, the case where the reallocation target directory A and the reallocation target directory B are in the state shown in FIG. 14 will be described.

  For example, in this state, as shown in the column 401, the average access count of the relocation target directory A is larger than the average access count of the relocation target directory B. Therefore, in this state, when the condition of the promotion policy is set using the average number of accesses, the relocation target directory A is promoted in preference to the relocation target directory B. On the other hand, as shown in the column 402, the total access count of the relocation target directory B is larger than the total access count of the relocation target directory A. Therefore, in this state, when the promotion policy condition is set using the total number of accesses, the relocation target directory B is promoted in preference to the relocation target directory A. As described above, the relocation target directory that is the relocation execution directory differs depending on the setting conditions of the promotion policy. Therefore, it is preferable that the administrator appropriately select the promotion policy and the demotion policy so that an appropriate file is rearranged in accordance with the operation state.

  The movement determination unit 12 notifies the file movement unit 13 of whether the information of the extracted rearrangement execution directory is to be demoted or promoted. The movement determination unit 12 is an example of a “movement target selection unit”.

  The file moving unit 13 receives information on the relocation execution directory and information on whether the relocation execution directory is to be demoted or promoted from the movement determination unit 12.

  The file moving unit 13 uses the hierarchy management table 51 to specify a file under the designated relocation execution directory. Then, the file moving unit 13 executes the designated demotion or promotion process on the identified file, rearranges the file, and changes the hierarchy of the storage medium in which the file exists.

  The request processing unit 14 receives a processing request for a file such as a read request or a write request from the server 2. Then, the request processing unit 14 acquires the storage location of the file specified by the processing request from the hierarchy management table 51. Then, the request processing unit 14 executes a designated process on the acquired file at the storage location.

  The request processing unit 14 then updates the information in the hierarchy management table 51 for the file that is the target of the executed process, according to the executed process. For example, the request processing unit 14 updates the access count and the last reference date / time in the hierarchy management table 51. When the file is deleted, the request processing unit 14 updates information on the control directory related to the file deleted from the hierarchy management table 51. When a file is added, the request processing unit 14 updates the control directory information related to the added file to the hierarchy management table 51.

  The request processing unit 14 also updates the metadata 53 and FCL 54 information for the file that is the target of the executed process.

  Next, with reference to FIG. 15, the overall flow of file relocation processing by the storage apparatus 1 according to the present embodiment will be described. FIG. 15 is a flowchart of a file relocation process performed by the storage apparatus according to the first embodiment.

  The group management unit 11 acquires designation from the operator of the relocation target directory and the non-relocation target directory (step S1). Furthermore, the group management unit 11 acquires information such as an inode number, a deletion deadline, an access upper limit value, and a lower limit value as setting information for the relocation target directory.

  Next, the group management unit 11 registers the acquired information on the relocation target directory and the non-relocation target directory in the hierarchy management table 51. Further, the group management unit 11 registers the setting of the relocation target directory in the hierarchy management table 51 using the setting information for the relocation target directory (step S2).

  Thereafter, the group management unit 11 initializes the hierarchy management table 51 (step S3). Specifically, the group management unit 11 initializes information on the number of accesses and the last reference date and time in the hierarchy management table 51.

  The request processing unit 14 performs processing for each file in accordance with the processing request from the server 2, and records file access information by the executed processing in the hierarchy management table 51 (step S4).

  The movement determination unit 12 extracts a relocation target directory that satisfies the promotion policy or the demotion policy as a relocation execution directory (step S5).

  Next, the migration determination unit 12 notifies the file migration unit 13 of the information on the relocation execution directory and the information on the process to be promoted or demoted. The file moving unit 13 executes the rearrangement of the files under the rearrangement execution directory in accordance with the received notification (step S6).

  The group management unit 11 uses the hierarchy management table 51 to determine whether or not there is a relocation target directory that is the target of directory hierarchy migration from the number of accesses and the upper limit value and the lower limit value of each relocation target directory. (Step S7). If there is no relocation target directory to be transferred (No at Step S7), the group management unit 11 proceeds to Step S9.

  On the other hand, when there is a relocation target directory to be migrated (step S7: Yes), the group management unit 11 performs a process of raising or lowering the directory hierarchy to which the relocation target directory to be migrated belongs. Execute (step S8).

  Then, the group management unit 11, the migration determination unit 12, and the file migration unit 13 determine whether to stop the operation of the storage device 1 (step S9). When the operation is stopped (step S9: Yes), the group management unit 11, the movement determination unit 12, and the file movement unit 13 end the file movement process.

  On the other hand, when the operation of the storage apparatus 1 continues (No at Step S9), the process executed by the storage apparatus 1 returns to Step S3.

  Next, the directory hierarchy lowering process will be described with reference to FIG. FIG. 16 is a flowchart of the directory hierarchy lowering process.

  The group management unit 11 searches the hierarchy management table 51 for a relocation target directory whose access count is equal to or greater than the upper limit of the access count (step S101).

  The group management unit 11 determines whether there is a descending target directory whose access count is equal to or greater than the upper limit value (step S102). When there is no descending target directory (No at Step S102), the group management unit 11 ends the descending process.

  On the other hand, when there is a descending target directory (step S102: affirmative), the group management unit 11 searches the directory hierarchy below the descending target directory using the metadata 53 (step S103).

  Then, the group management unit 11 determines whether a directory exists immediately below the descending target directory (step S104). When the directory does not exist immediately below (No at Step S104), the group management unit 11 proceeds to Step S106.

  On the other hand, when a directory exists immediately below (step S104: affirmative), the group management unit 11 registers all the directories directly below the descending target directory as the relocation target directory in the hierarchy management table 51 (step S105). .

  Next, the group management unit 11 searches for a file immediately under the descending target directory using the metadata 53 (step S106).

  Then, the group management unit 11 determines whether a file exists immediately below the descending target directory (step S107). When the file exists immediately below (Step S107: Yes), the group management unit 11 updates the hierarchy management table 51 with the descending target directory as the relocation target directory for only the direct files (Step S108).

  On the other hand, when the file does not exist immediately below (No at Step S107), the group management unit 11 deletes the descending target directory from the hierarchy management table 51 (Step S109).

  Next, with reference to FIG. 17, a description will be given of the process of raising the directory hierarchy. FIG. 17 is a flowchart of the directory hierarchy up process.

  The group management unit 11 searches the hierarchy management table 51 for a relocation target directory whose access count is less than or equal to the lower limit value of the access count (step S201).

  The group management unit 11 determines whether there is a rising target directory whose number of accesses is equal to or less than the lower limit (step S202). When there is no increase target directory (No at Step S202), the group management unit 11 ends the increase process.

  On the other hand, when there is a rising target directory (step S202: Yes), the group management unit 11 searches the directory hierarchy higher than the rising target directory using the metadata 53 (step S203).

  Then, the group management unit 11 determines whether the ascent target directory is the highest hierarchy directory (step S204). In the case of the highest hierarchy directory (step S204: Yes), the group management unit 11 ends the ascending process.

  On the other hand, when the directory is not the highest hierarchy directory (No at Step S204), the group management unit 11 determines whether or not there is the same directory that is under the same directory and is a directory of the same hierarchy ( Step S205). When there is no directory in the same row (No at Step S205), the group management unit 11 proceeds to Step S208.

  On the other hand, when the same directory exists (step S205: Yes), the group management unit 11 determines whether or not the number of accesses to the same directory is equal to or lower than the lower limit of the number of accesses (step S206). When larger than the lower limit (No at Step S206), the group management unit 11 ends the ascending process.

  On the other hand, when the value is equal to or lower than the lower limit (step S206: Yes), the group management unit 11 deletes the same directory from the hierarchy management table 51 (step S207).

  Then, the group management unit 11 deletes the ascent target directory from the hierarchy management table 51 (step S208).

  Further, the group management unit 11 updates the hierarchy management table 51 with the directory that is one level higher than the relocation target directory whose access count is less than or equal to the lower limit value of the access count as the relocation target directory (step S209).

  As described above, the storage apparatus according to the present embodiment groups files, determines whether or not the rearrangement condition is satisfied for each group, and rearranges the files belonging to the group. As a result, metadata search and FCL analysis processing in rearrangement can be omitted, and the load on the CPU can be reduced and the processing time can be shortened.

  Further, since the FCL is not used for the rearrangement, a configuration in which the FCL is not arranged in the storage apparatus can be used. When the FCL is used for file relocation, the FCL becomes enormous as the number of files to be relocated is increased. On the other hand, when the configuration in which the FCL is not arranged is used, it is possible to reduce the compression of the disk area due to the increase in the number of files to be determined for the rearrangement.

  Next, Example 2 will be described. The storage apparatus according to the present embodiment is different from the first embodiment in that the relocation target directory is automatically determined by grouping the directory. A block diagram of the storage apparatus according to this embodiment is also shown in FIG. In the following description, description of the same functions as those of the first embodiment will be omitted.

  FIG. 18 is a diagram of an example of a hierarchy management table according to the second embodiment. As illustrated in FIG. 18, the hierarchy management table 51 according to the present embodiment includes an item of monitoring in addition to the same items as in the first embodiment. The monitoring value is set by the administrator.

  When the monitoring value is “Yes”, this indicates that the relocation target directory is a grouping target. On the other hand, if the monitoring value is “No”, this indicates that the relocation target directory is not a grouping target. Hereinafter, the relocation target directory whose monitoring value is “Yes” is referred to as the “monitoring target” relocation target directory.

  In this embodiment, the relocation policy definition 52 has a relocation policy for each directory.

  When the relocation target directory is not set, the group management unit 11 determines the highest directory among all the directories including the directory of the same relocation policy as the relocation target directory.

  Further, the group management unit 11 refers to the hierarchy management table 51 before the directory hierarchy migration processing of the relocation target directory, and determines whether or not each relocation target directory at that time is a monitoring target.

  Next, when there is a relocation target directory to be monitored, the group management unit 11 changes the relocation policy from the relocation policy definition 52 in order from the lowest directory among the directories under the relocation target directory. get. Then, the group management unit 11 lowers the directory hierarchy by setting the highest directory among the directories including directories with the same relocation policy as the relocation target directory.

  Here, with reference to FIG. 19, the lowering of the relocation target directory by grouping will be described. FIG. 19 is a diagram illustrating an example of lowering a relocation target directory by grouping.

  A case where the directory 351 is a relocation target directory will be described. The group management unit 11 uses the hierarchy management data 51 to determine whether each relocation target directory including the directory 351 is a monitoring target before performing directory migration.

  Since the directory 351 is a monitoring target, the group management unit 11 acquires from the relocation policy definition 52 the relocation policies of the directories 352 to 355 that are the lowermost directories among the directories under the directory 351.

  In this case, it is assumed that the relocation policies of the directory 352 and the directories 353 to 355 are different. Therefore, the group management unit 11 traces the directory 352 in the upper direction of the directory hierarchy, and specifies the directory 356 as the highest directory including the directory having the same relocation policy. Further, the group management unit 11 traces the directories 353 to 355 in the upper direction of the directory hierarchy, and specifies the directory 357 as the highest directory including the directory having the same relocation policy.

  Then, the group management unit 11 lowers the relocation target directory from the directory 351 to the directories 356 and 357. In this case, the directory 356 that is the relocation target directory is regarded as the highest level, and the directory surrounded by the frame 361 is treated as one group. Further, with the directory 357 as the relocation target directory as the highest level, the directory surrounded by the frame 362 is treated as one group.

  Here, the case where the relocation target directory has already been set has been described, but the group management unit 11 creates a group by the same process and determines the relocation target directory even when the relocation target directory is not set. To do.

  Next, with reference to FIG. 20, the overall flow of file relocation processing by the storage apparatus 1 according to the present embodiment will be described. FIG. 20 is a flowchart of file relocation processing by the storage apparatus according to the second embodiment.

  The group management unit 11 acquires designation from the operator of the relocation target directory and the non-relocation target directory (step S301). Furthermore, the group management unit 11 acquires information such as an inode number, a deletion deadline, an access upper limit value, and a lower limit value as setting information for the relocation target directory.

  Next, the group management unit 11 registers the acquired information on the relocation target directory and the non-relocation target directory in the hierarchy management table 51. Further, the group management unit 11 registers the setting of the relocation target directory in the hierarchy management table 51 using the setting information for the relocation target directory (step S302).

  Thereafter, the group management unit 11 initializes the hierarchy management table 51 (step S303). Specifically, the group management unit 11 initializes information on the number of accesses and the last reference date and time in the hierarchy management table 51.

  The request processing unit 14 processes each file in accordance with the processing request from the server 2 and records file access information by the executed processing in the hierarchy management table 51 (step S304).

  The movement determination unit 12 extracts a relocation target directory that satisfies the promotion policy or the demotion policy as a relocation execution directory (step S305).

  Next, the migration determination unit 12 notifies the file migration unit 13 of the information on the relocation execution directory and the information on the process to be promoted or demoted. The file moving unit 13 executes the rearrangement of the files under the rearrangement execution directory according to the received notification (step S306).

  The group management unit 11 uses the hierarchy management table 51 to determine whether there is a relocation target directory to be monitored (step S307). When there is a relocation target directory to be monitored (step S307: Yes), the group management unit 11 checks the relocation policy of the directory under the relocation target directory to be monitored with the relocation policy definition 52. Then, the group management unit 11 performs grouping by using the highest directory of directories including only the same relocation policy as a relocation target directory, and lowers the relocation target directory (step S308). Then, the group management unit 11 proceeds to step S311.

  On the other hand, when there is no relocation target directory to be monitored (No at Step S307), the group management unit 11 uses the hierarchy management table 51 to determine whether there is a relocation target directory that is a target of directory hierarchy migration. Is determined (step S309). Specifically, the group management unit 11 determines whether there is a relocation target directory that is a target of directory hierarchy migration from the number of accesses, the upper limit value, and the lower limit value of each relocation target directory. When there is no relocation target directory to be migrated (No at Step S309), the group management unit 11 proceeds to Step S311.

  On the other hand, when there is a relocation target directory to be migrated (step S309: Yes), the group management unit 11 performs a process of raising or lowering the directory hierarchy to which the relocation target directory to be migrated belongs. Execute (Step S310).

  Then, the group management unit 11, the migration determination unit 12, and the file migration unit 13 determine whether or not to stop the operation of the storage device 1 (step S311). When the operation is stopped (step S311: Yes), the group management unit 11, the movement determination unit 12, and the file movement unit 13 end the file movement process.

  On the other hand, when the operation of the storage apparatus 1 continues (No at Step S311), the process executed by the storage apparatus 1 returns to Step S303.

  As described above, the storage apparatus according to the present embodiment can automatically determine the relocation execution directory by performing directory grouping. This makes it possible to automatically set the relocation execution directory when the administrator does not set the relocation execution directory or when the administrator wants to lower the relocation execution directory. be able to.

  Next, Example 3 will be described. The storage apparatus according to the present embodiment is different from the first embodiment in that the storage medium on which the file is arranged is changed in consideration of the free state of the upper storage medium. A block diagram of the storage apparatus according to this embodiment is also shown in FIG. In the following description, description of the same functions as those of the first embodiment will be omitted.

  The migration determination unit 12 performs the metadata 53 from the result of the relocation determination after executing the relocation determination of the file for the relocation target disk and before actually executing the relocation of the file. Is used to calculate the amount of data transferred to each Tier. Next, the movement determination unit 12 calculates the free capacity of the flash 151 and the SAS 152.

  When it is determined that more free capacity than the predetermined upper limit capacity is generated in the flash 151 or the SAS 152, the movement determination unit 12 relocates a directory with a shorter unaccessed period or a higher access frequency than other directories. Specify the target directory. Then, the movement determination unit 12 arranges the identified relocation target directory having a high access frequency in the flash 151 or the SAS 152. As a result, more files can be placed in the upper directory, and the processing efficiency can be improved by using the storage medium more efficiently.

  On the other hand, when the flash 151 or the SAS 152 has no free space or becomes smaller than a predetermined lower limit capacity, the movement determination unit 12 identifies a relocation target directory with low access frequency among the relocation target directories. . Then, the movement determination unit 12 arranges the identified relocation target directory with a low access frequency in a lower storage medium. As a result, the free capacity of the upper storage medium can be secured, and more efficient file arrangement can be realized.

  As described above, the storage apparatus according to the present embodiment determines the relocation target directory to be relocated, and adjusts the relocation target directory to be relocated according to the free state of the storage medium. As a result, the files can be arranged more appropriately, and the processing capacity of the storage apparatus can be improved.

(Hardware configuration)
FIG. 21 is a hardware configuration diagram of the storage apparatus. The storage apparatus 1 includes a CPU (Central Processing Unit) 91, a memory 92, a flash 151, a SAS 152, and a SATA 153.

  The flash 151 stores various programs including programs for realizing the processes of the movement determination unit 12, the file movement unit 13, and the request processing unit 14 illustrated in FIG.

  The CPU 91 reads various programs from the flash 151, develops them on the memory 92, and executes them, thereby realizing the processes of the movement determination unit 12, the file movement unit 13, and the request processing unit 14 illustrated in FIG. 1.

  Here, in order to speed up the processing, various programs are stored in the flash 151. However, the present invention is not limited to this, and the programs may be stored in the SAS 152 and the SATA 153. In each embodiment, the case where the hierarchy management table 51, the relocation policy definition 52, the metadata 53, and the FCL 54 are stored in the flash 151 has been described as an example. However, the storage location is not limited to this, and for example, in the SAS 152 and the SATA 153 It may be stored.

  In the above description, the case where the file reprocessing process exists in the storage apparatus 1 has been described as an example. However, for example, the file relocation processing process may be operated on the server 2. In that case, the storage device control program that realizes the processes of the migration determination unit 12, the file migration unit 13, and the request processing unit 14 is executed by the CPU on the server 2 to implement each function.

  The following supplementary notes are further disclosed with respect to the embodiments including the above examples.

(Supplementary note 1) a storage unit having a plurality of hierarchies;
A group management unit for dividing and managing a file stored in any one of the hierarchies of the storage unit into a plurality of groups;
A movement target selection unit that selects a group that satisfies a hierarchy movement condition among a plurality of the groups as a movement target of the hierarchy;
A storage apparatus, comprising: a file moving unit that moves an affiliation file belonging to the group selected by the movement target selection unit from a tier in which the affiliation file is stored to another tier.

(Supplementary note 2) The supplementary note 1 is characterized in that the migration target selection unit determines whether or not the specific group satisfies a hierarchy migration condition based on an access frequency to the belonging file of the specific group. The storage device described.

(Additional remark 3) The said movement object selection part is based on the average access number to the said affiliation file of the said specific group, the sum total of the access number of the affiliation file, or the access date of the said affiliation file. The storage apparatus according to appendix 2, wherein it is determined whether or not a tier movement condition is satisfied.

(Additional remark 4) The said movement object selection part determines whether an access frequency exceeds an upper limit threshold value based on the average access count to the said affiliation file of the said specific group, or the sum total of the access count of the affiliation file. When the access frequency exceeds an upper threshold, the file belonging to the specific group is a group that moves to a higher hierarchy, and the access frequency is set to a lower limit based on the access date and time to the file belonging to the specific group. The storage according to appendix 3, wherein it is determined whether or not a threshold is exceeded, and when the access frequency exceeds a lower limit threshold, the belonging file of the specific group is a group that moves to a lower hierarchy. apparatus.

(Additional remark 5) The said movement object selection part makes the said specific group the object of the movement of the said hierarchy based on the free capacity of the hierarchy of a movement destination in addition to whether the said specific group satisfy | fills a hierarchy movement condition. The storage apparatus according to any one of appendices 1 to 4, wherein whether or not to select is determined.

(Supplementary note 6) The storage apparatus according to supplementary note 2, wherein the group management unit performs integration and division of the groups based on an access frequency of the group to be managed to the belonging file.

(Supplementary note 7) When the total number of accesses to the files belonging to the group to be managed is equal to or greater than a predetermined upper limit value, the group management unit divides the group to be managed, and the group of the management target group The storage device according to appendix 6, wherein the group to be managed is integrated when the total number of accesses to the belonging file is equal to or less than a predetermined lower limit value.

(Supplementary note 8) The storage device according to any one of supplementary notes 1 to 7, wherein the group management unit uses a directory as the group.

(Supplementary note 9) The storage apparatus according to any one of supplementary notes 1 to 8, wherein the movement target selection unit does not select a group designated in advance as a movement target.

(Supplementary note 10) The storage apparatus according to any one of supplementary notes 1 to 9, wherein the tier is divided according to a processing speed of a storage medium included in the storage unit, and the higher the processing speed, the higher the tier. .

(Supplementary Note 11) A file stored in one of the hierarchies of the storage device is divided into a plurality of groups for management,
Select a group that satisfies the hierarchy movement condition among the plurality of groups as a target for movement of the hierarchy,
A storage apparatus control method, comprising: moving an affiliation file belonging to a selected group from a tier storing the affiliation file to another tier.

(Supplementary note 12) A file stored in one of the hierarchies of the storage device is divided into a plurality of groups for management,
Select a group that satisfies the hierarchy movement condition among the plurality of groups as a target for movement of the hierarchy,
A storage apparatus control program that causes a computer to execute a process of moving an affiliation file belonging to a selected group from a tier in which the affiliation file is stored to another tier.

DESCRIPTION OF SYMBOLS 1 Storage apparatus 2 Server 11 Group management part 12 Movement determination part 13 File movement part 14 Request processing part 15 Storage part 51 Hierarchy management table 52 Relocation policy definition 151 Flash
152 SAS
153 SATA

Claims (8)

A storage unit having a plurality of hierarchies;
A group management unit for dividing and managing a file stored in any one of the hierarchies of the storage unit into a plurality of groups;
A movement target selection unit that selects a group that satisfies a hierarchy movement condition among a plurality of the groups as a movement target of the hierarchy;
A storage apparatus, comprising: a file moving unit that moves an affiliation file belonging to the group selected by the movement target selection unit from a tier in which the affiliation file is stored to another tier.   2. The storage according to claim 1, wherein the movement target selection unit determines whether or not the specific group satisfies a hierarchy movement condition based on an access frequency to the belonging file of the specific group. apparatus.   The movement target selection unit, based on the average number of accesses to the belonging file of the specific group, the total number of accesses of the belonging file, or the access date and time of the belonging file, The storage apparatus according to claim 2, wherein it is determined whether or not it is satisfied.   The movement target selection unit determines whether the access frequency exceeds an upper limit threshold based on an average access count to the belonging file of the specific group or a total access count of the belonging file, and the access frequency If the file exceeds the upper threshold, the file belonging to the specific group is moved to a higher hierarchy, and the access frequency exceeds the lower threshold based on the access date and time to the file belonging to the specific group 4. The storage apparatus according to claim 3, wherein if the access frequency exceeds a lower limit threshold, the file belonging to the specific group is a group that moves to a lower hierarchy.   Whether the movement target selection unit selects the specific group as the movement target of the hierarchy based on whether or not the specific group satisfies the hierarchy movement condition and based on the free capacity of the movement target hierarchy. The storage apparatus according to claim 1, wherein it is determined whether or not.   The storage apparatus according to claim 2, wherein the group management unit integrates and divides the groups based on an access frequency of the group to be managed to the file to which the group belongs. A file stored in one of the hierarchies of the storage device is divided into a plurality of groups and managed,
Select a group that satisfies the hierarchy movement condition among the plurality of groups as a target for movement of the hierarchy,
A storage apparatus control method, comprising: moving an affiliation file belonging to a selected group from a tier storing the affiliation file to another tier. A file stored in one of the hierarchies of the storage device is divided into a plurality of groups and managed,
Select a group that satisfies the hierarchy movement condition among the plurality of groups as a target for movement of the hierarchy,
A storage apparatus control program that causes a computer to execute a process of moving an affiliation file belonging to a selected group from a tier in which the affiliation file is stored to another tier.

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